Safety device for muffles, cupolas, and other furnaces.



E. BEIJING.

SAFETY DEVICE FOR MUPFLES, CUPOLAS, AND OTHER FURNACES.

APPLICATION TILED APR, 1014.

1 1 21 ,969, Patented Dec. 22. 1914.

WW 4 3 liagalm ERNST BELING, O1? VIENNA, AUST;

SAFETY DEVICE F63 MUFFLES, AND

Specification of Letters Eatent.

Dec. 22, 1914.

Application filed April 6, 1914. Serial No. 829,772t.

To (ZZZ whom it may concern Be it known that I, ERNST BELING, engineer,subject of the Emperor of Austria- Hungary, residing at Vienna,Austria-Hungary, have invented certain new and useful Improvements inSafety Devices for h luifles, Cupolas, and oth r Furnaces, of which thefollowing is a specification.

The object of the present invention is a safety device for furnaces,mufies, or cupolas, of such construction that when the blast in the airduct or pipe is out off, a valve, disk or the like opens, whereby theinterior of the muflie is connected to the atmosphere so that the gasesformed when turning the last on again are rendered unexplosive.

The present invention consists of an adj ustable valve whichautomatically opens when the blast is out OE, and only automaticallycloses when the blast has reached a given pressure. VJ hen the blast isturned on again and as long as the valve remains open, the blast blowsthe explosive mixture of gases into the atmosphere. To accomplish thisit is advantageous to fix a disk-valve in the blast pipe, of which thespring is so adjusted that it keeps the valve open till the blast onbeing turned on reaches a given pressure.

The invention will be fully described with reference to the accompanyingdrawings.

Figure 1, enlarged details of valve. Fig. 2 shows the lower part of aoupola with a safety valve connected to the blast-pipe according to thepresent invention.

The safety device consists of a cast-iron cylinder a with a connection2' and an upper perforated dome Z) and lower perforated dome c. Thecylinder in its upper part is provided with the safety valve cl and inits lower part with the air inlet valve 6. The cupola valve is connectedto the air duct 7 of the cupola g by means of the connection 2' to theair duct it. The inlet valve 6 is kept open by means of a spring whenthe blast is off and automatically closes when the pressure in the blastpipe has reached a given pressure on turning on the blast. The spring isis adjustable so that it can be set to any desired pressure. The purposeof the air inlet valve is in the first place to prevent cupolaexplosions, so very frequent in practice. These explosions are caused byhaving the blast stopped during the working for some cause or other,when the carbon-dioxid is reduced to carbon-monoxid, flowing into theducts. On turning on the blast again oxygen is mixed with the carbonmonoxid ith the result that the mixture of gases tires and exploc es.The danger of such explosion is prevented from the start by the use ofthe cupola valve, since as soon as the blast is turned off, that is, assoon as the pressure in the blast pipe has reached its minimum the alvedisk 6 is lifted by the spring is and fresh air enters through theperforations in the dom c, and through the lower valve opening. Thefresh supply of air serves the purpose of creating a natural draft, thuspreventing the collecting of carbon-monoxid. The air-valve e is soconstructed that on turning on the blast it blows first into theatmosphere, thus completely clearing the air ducts of any gases. Onlyafter completely clearing the gases and on reaching a certain pressuredoesthe air valve close automatically when the blast is then led intothe cupola or muflie. Thereby all residual gases remaining in the airducts are rendered unexplosive. It is only after exceeding the minimumpressure that the air inlet valve 6 closes automatically.

The safety valve (Z is for the purpose of aifording an escape of anyexcess of pressure caused by the clogging up or clinkering of theperforations, thus protecting the blast and its gear. Furthermore, onthe top of the safety valve (Z is contact device, for ringing an alarmon exceeding the normal pressure.

The contact device consists as is shown in Fig. 1 of a lever or arm Zwhich is fixed to the cap m of ti e dome 6. Thus on the valve (Z openingthe arm or lever is moved by the valve spindle 12, causing the electriccontacts 0 and p to meet simultaneously closing the circuit.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is:

l. A safety device for furnaces, comprising a casing adapted tocommunicate with atmosphere and iaving a valve seat therein, a valvemovable in a rectilinear path in said casing and tending to seat uponprevalence of a predetermined pressure within said casing, and cushionmeans to resist the seating tendency of the valve.

2. A safety device for the purnose specified, embodying a casingcomprising two valves, valve seats adjacent each of the end portions ofsaid casing, a valve operatively related to each seat, one of saidvalves being adapted to be unseated by excess pressure Within the casingand means whereby the other valve is held from its seat until apredetermined pressure prevails Within said casing.

3. A safety device for the purpose specified, embodying a casing havinga portion thereof perforated, a valve within said casing interposedbetween the perforated and intact -parts of the casing, and adjustablespring means for holding said valve from its seat until a predeterminedpressure prevails Within the intact part of said casing.

4. A safety device for the purpose specified, embodying a casing havingan intermediate intact portion and oppositely disposed perforated endportions, a valve seat adjacent each of said end portions, a valveoperatively related to each seat, one of said valves being adapted to beunseated by excess pressure Within the intact portion of said casing,and means whereby the other valve is held from its seat until apredetermined pressure prevails Within said intact portion.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

ERNST BEIJING.

Witnesses RUDOLF THEUMER, Vroron Bnm.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

